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                适者                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><div>
<div>【题目背景】</div>
<div>&ldquo;虽然不知道那两台是谁干掉的，不过任务完成了。&rdquo;一一次祖伽密．</div>
<div>【题意描述】</div>
<div>敌方有n台人形兵器，每台的攻击力为Ai，护甲值为Di。我方只有一台人形兵器，攻击力为ATK。战斗看作回合制，</div>
<div>每回合进程如下：</div>
<div>&nbsp; &middot;1 我方选择对方某台人形兵器并攻击，令其护甲值减少ATK，</div>
<div>若护甲值&lt;0则被破坏。</div>
<div>&nbsp; &middot;2 敌方每台未被破坏的人形兵器攻击我方基地造成Ai点损失。</div>
<div>但是，在第一回合开始之前，某两台敌方的人形兵器被干掉了(秒杀）。问最好情况下，我方基地会受到多少点损</div>
<div>失。</div>
</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>
<div>第一行两个数n，ATK，表示敌方人形兵器数量和我方人形兵器攻击力。</div>
<div>接下来n行，每行两个数A，Di，表示对方第i台人形兵器的攻击力和护甲值。</div>
<div>3&lt;=n&lt;=3&times;10^5，Ai，Di&lt;=10^4，ATK&lt;10^4</div>
</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>只一行，一个数，表示最好情况下我方基地会受到的损失总和。</div>
<p></p></p><hr/><h3>样例输入</h3><pre>3 7
30 8
7 35
1 209</pre><hr/><h3>样例输出</h3><pre>28
【样例说明】
最好情况下，被秒杀的是敌方1、3号人形兵器，接下来需要5回合解决对方的2号人形兵器，对方共攻击4次，总计
造成28点伤害。可以证明没有更优的情况。</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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